JSP, Apache, tomcat problem

I dont know where to put this post.. but I am in real bad shape.. I have a website www.hala.com .. I have configured it to run with mod_jk connector to run apache and tomcat on same port... The problem is, my Linux server gets struck after running few days and all the jsp sites render very slowly.. I checked on server and run command "top" to find CPU usage, it showed CPU 98% in use and all this is used up by a process "Java" must be tomcat..

Then I used to kill that process and restart tomcat again. and it works fine for few days again come across the same problem..

Again I have to repeat the process (kill java process and start tomcat).